"How much should I spend on ads to scale?" is the most frequent question in our diagnostics, and the honest answer starts with a change of reference: you do not budget on current revenue, you budget on target revenue.
The base rule: 10 to 20% of target revenue
A growing e-commerce brand typically invests between 10 and 20% of its target revenue in acquisition. Aiming for $5M means an annual budget of $500k to $1M, or $40k to $85k per month. If that number feels impossible, the problem is not the budget: it is margin or AOV that cannot yet support the growth you are targeting.
The exact percentage depends on contribution margin after variable costs. Strong margin and high LTV: push toward 20%. Thin margin and one-time purchases: stay conservative at 10-12%.
“Budget 10-20% of target revenue, not current: aiming for $5M = $40-85k/month in acquisition.”
The invisible plateau between $1M and $2M
Going from $1M to $2M is often harder than going from $2M to $5M. At that level, your warm audiences are saturated and your creative volume stops being enough: moving from 3 new creatives per month to 15-20 changes more than any bidding tool.
It is also where diversification starts: a second paid channel, email driving 25-30% of revenue, and SEO foundations.
Steer by MER, not platform ROAS
As you scale, platform ROAS becomes mechanically less reliable (attribution, windows, cross-channel double counting). The steering metric becomes MER: total revenue divided by total ad spend. Define your MER floor (where contribution margin stays positive) and scale as long as you are above it.
The three mistakes that burn margin
1. Scaling budget without scaling creative production: CPM rises, fatigue sets in, the extra budget buys repetition.
2. Cutting after one bad week: learning resets and costs more than the week you lost.
3. Ignoring LTV: if 30% of your customers buy again, you can pay more for acquisition than your competitors and still win.